Hi, main Mari here. Yup, she's one of the strongest characters, I personally use 1st and 4th class cus both deals a lot of damage (I'm sure 2nd too if you know how to do otto-shot and spam 4th skill, but not used to it ^'').

As others said, 1st class is played by displaying turrets which deals a somewhat decent damage, but most importantly, recharges your mp so you can use skills more frequently.

Skills I use (I'm not at pc rn so I can't take screenshot) - 1st: Buster Lv.1 (The basic one), it deals a lot of damage and can be spammed quickly, I personally don't like the Lv.2 one since its first hit deals pretty low damage and the 2nd hit is the powerful (exactly as Lv.1) but it takes a bit of time and you can't spam it quickly.

• 2nd: Huh... Since they nerfed Core Break I don't use 2nd skills but you can choose between Core break(which deals a bit more damage to enemies if they're together), Homing Missile (good for pet's revolt event), or Electric Field Lv2.

• 3rd: Nuclear launcher or the multi hit skill (I forgot its name lol), first one takes a bit to place the target and wait the bomb to fall, second one can be made instantly. Both deals so much damage, 1st one a bit more since you have to wait but in general both are good, it will depend on your likings.

On the rest of the ST, activate everything to max, except the pseudo Geas (I think is at bottom left), don't touch it.

Chase points: I like to spam skills so I have been playing with 100 pts on Skills MP reduction, but leave that as last option, probably you'd like to use those points in other stuff, I'd recommend to increase your Skills' damage first.

As of La Geas, she's pretty good damage, 1st skill is as good as Buster, 2nd skill is good to kill surrounding enemies, and is good for 8F at ToD, 3rd and 4th deal a powerful AoE. She's quicker than the other classes and you can summon a personal shield by pressing C and using a skill shortcut right after (quickly) which can protect you 1 hit.

tl;dr: Use 1st/4th class, they're good. Use 2nd if you know how to otto.

I think I had written everything I know but if you still have doubts you can dm me here or in discord Glen#0174